Symmetries of Spacetimes and Riemannian Manifolds Autor Krishan L Duggal et al. 30 iun 1999 Hardback Preț: 376.01 lei 6-8 săpt.
Null Curves and Hypersurfaces of Semi-Riemannian Manifolds Autor Krishan L Duggal et al. noi 2007 Hardback Preț: 562.48 lei 730.49 lei Se retipărește -23%